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— — — — Routed Protocol Versus Routing Protocol Section 23: Implementing Dynamic Routing The following are the differences between a routed protocol and a routing protocol: Routed protocols: This type of network protocol provides enough information in its network layer address to enable a packet to be forwarded from one host to another host based on the addressing scheme, without knowing the entire path from the source to the destination. Packets generally are conveyed from an end system to another end system. IP is an example of a routed protocol. Routing protocol: This type of protocol facilitates the exchange of routing information between networks, enabling routers to build routing tables dynamically. Traditional IP routing stays simple because it uses next­hop (next­router) routing, in which the router needs to consider only where it sends the packet and does not need to consider the subsequent path of the packet on the remaining hops (routers). Routing protocols describe the following information: How updates are conveyed What knowledge is conveyed When to convey the knowledge How to locate the recipients of the updates You can classify dynamic routing protocols using many different methods. One method to classify a routing protocol is to determine if it is used to route in an AS or between autonomous systems. Autonomous systems are collections of networks under a common administration that share a common routing strategy. Types of Routing Protocols There are two types of routing protocols: IGPs: Interior gateway protocols exchange routing information within an AS. Those networks are controlled by a single organization. An AS commonly comprises many individual networks belonging to companies, schools, and other institutions. RIPv2, EIGRP, and OSPFare examples of IGPs. Some IGPs may be adequate in large corporate networks but are not designed to handle tens of thousands or hundreds of thousands of routes, such as the many thousands of routes that are present on the Internet. EGPs: Exterior gateway protocols are used to route between autonomous systems. BGP is the EGP of choice in networks today. EGPs, however, are designed for use between autonomous systems that are under the control of different administrations. BGP is an example of an EGP and is the routing protocol that is used in the Internet. BGP is a path vector protocol that can use many different attributes to measure routes. BGP is typically used between ISPs and sometimes between a company and an ISP. The figure shows the logical separation of where an IGP operates and where an EGP operates. Up Next: Distance Vector and Link­State Routing Protocols